Hi Karl,
Thanks for the comments. I'm glad you picked up on the facial expression, the working title for this piece was 'Thinking of home..?'.
The mud on the greatcoat is an old trick, talcum powder mixed in with the paint to give it texture, followed by a very light drybrushing of a paler colour to show where the mud has dried. Just don't let SWMBO catch you borrowing her stuff!